Saky irin Martensitic alagbara, irin ni a irú ti chromium alagbara, irin eyi ti o ntẹnumọ martensitic microstructure ni yara otutu, ti ohun ini le wa ni titunse nipa ooru itọju (quenching ati tempering). Ni gbogbogbo, o jẹ iru irin alagbara, irin lile lile. Lẹhin quenching, tempering ati annealing ilana, Lile ti awọn 440 irin alagbara, irin ti a ti dara si gidigidi ju ti miiran alagbara ati ooru sooro irin. O ti wa ni commonly lo ninu awọn iṣelọpọ ti nso, gige irinṣẹ, tabi ṣiṣu molds ti o nilo ga èyà ati ki o wọ resistance labẹ ipata awọn ipo. American boṣewa 440 jara alagbara, irin pẹlu: 440A, 440B, 440C, 440F. Akoonu erogba ti 440A, 440B ati 440C pọ si ni itẹlera. 440F (ASTM A582) jẹ iru irin gige ọfẹ pẹlu akoonu S ti a ṣafikun lori ipilẹ ti 440C.
Awọn ipele deede ti 440 SS
| Amerika | ASTM | 440A | 440B | 440C | 440F |
| UNS | S44002 | S44003 | S44004 | S44020 | |
| Japanese | JIS | SUS 440A | SUS 440B | SUS 440C | SUS 440F |
| Jẹmánì | DIN | 1.4109 | 1.4122 | 1.4125 | / |
| China | GB | 7Cr17 | 8Cr17 | 11Cr17 9Cr18Mo | Y11Cr17 |
Kemikali Tiwqn Of 440 SS
| Awọn ipele | C | Si | Mn | P | S | Cr | Mo | Cu | Ni |
| 440A | 0.6-0.75 | ≤1.00 | ≤1.00 | ≤0.04 | ≤0.03 | 16.0-18.0 | ≤0.75 | (≤0.5) | (≤0.5) |
| 440B | 0.75-0.95 | ≤1.00 | ≤1.00 | ≤0.04 | ≤0.03 | 16.0-18.0 | ≤0.75 | (≤0.5) | (≤0.5) |
| 440C | 0.95-1.2 | ≤1.00 | ≤1.00 | ≤0.04 | ≤0.03 | 16.0-18.0 | ≤0.75 | (≤0.5) | (≤0.5) |
| 440F | 0.95-1.2 | ≤1.00 | ≤1.25 | ≤0.06 | ≥0.15 | 16.0-18.0 | / | (≤0.6) | (≤0.5) |
Akiyesi: awọn iye ti o wa ninu biraketi ti gba laaye ati kii ṣe dandan.
Lile Of 440 SS
| Awọn ipele | Lile, Annealing (HB) | Itọju igbona (HRC) |
| 440A | ≤255 | ≥54 |
| 440B | ≤255 | ≥56 |
| 440C | ≤269 | ≥58 |
| 440F | ≤269 | ≥58 |
Iru si arinrin alloy irin, Saky irin ká 440 jara Martensite alagbara, irin ni o ni awọn abuda kan ti ìşọn nipasẹ quenching, ati ki o le gba kan jakejado ibiti o ti darí ini nipasẹ o yatọ si ooru itọju. Ni gbogbogbo, 440A ni iṣẹ lile lile ti o dara julọ ati lile lile, ati lile rẹ ga ju ti 440B ati 440C. 440B ni o ni kan ti o ga líle ati toughness ju 440A ati 440C fun gige irinṣẹ, wiwọn irinṣẹ, bearings ati falifu. 440C naa ni líle ti o ga julọ ti gbogbo irin alagbara ati irin ti o ni aabo ooru fun awọn irinṣẹ gige didara, awọn nozzles ati awọn bearings. 440F jẹ irin gige ọfẹ ati lilo ni akọkọ ni awọn lathes adaṣe.
Akoko ifiweranṣẹ: Oṣu Keje-07-2020